Sand blast barrel and elevator drive



April 30, 1929.

F. .1. HULL 1,711,024

SAND-BLAST BARREL AND ELEVATOR DRIVE 8 Sheets-Sheet 1 Filed Feb. 17, 1926 I April 30, 1929. F. J. HULL SAND BLAST BARREL AND ELEVATOR muvs Filed Feb; 17, 1926 8 Sneaks-sweet z April 30, 1929. F, HULL 1,711,024

SAND BLAST BARREL AND ELEVATOR DRIVE Filed Feb. 1'7, 1926 8 Sheets-Sheet 3 zfii l lii 2 April 30, 1929. F, J, HULL 1,111,024 SAND BLAST BARREL AND ELEVATOR DRIVE Filed Feb. 17, 1926 8 Sheets-Sheet 4 April 30, 1929. F, HULL 1,711,024

SAND BLAST BARREL AND ELEVATOR DRIVE Filed Feb. 17', 1926 8 Sheets-Sheet 5 \A/I'dEETSE i I raw/Lap. @w

April 30, 1929. F. J. HULL SAND BLAST BARREL A ND ELEVATOR DRIVE File i Feb. 17, 1926 M. o A ///o W q n L m 1Q lllIlml o 1l.J/ 8 .n

w an 1 m (3 w 3w 5% E 3 v gmnmtop April 30, 19 29. HULL 1,711,024

SAND BLAST BARREL AND ELEVATOR DRIVE I Fi led Feb. 17, 1926 8 Sheets-sheet 7 April 30, 1929. F, J. HULL 1,711,024 AND BLAST BARREL AND ELEVATOR DRIVE Filed Feb. 17, 1926 8 sheets-sheet a ell) Patented Apr. 30, 1929.

IJILOZ-tt FOSTER J. HULL, OF HAGERSTOWN, MARYIMAIJD TION, OF HAGLRSTQWN, MARYLAND, A u

SAND-BLAST BARREL AND Application filed February 17, 1928.

The in rcntion relates to pane blast machines ft] partimilarly oi the direct PI'C-'-3lll6 type in which istin or ot rli'icles to be subiecled to the abrasive ction are placed in .the rar or cylinder of the machine, the blast or air and abrasive particles being introduced near the centres o'f thc axial ends of the barrel which is rotated to agitate the castings and expose their various faces in turn at the surot the load where the encounter the irasive stream. While the sand blast sell. tor convenience, other abrasives than sand are generally used.

The castings till the barrel a little less than Iull. so that more than half the area of the cvlindrical wall is uncovered. This wall is perforated and the abrasive together with the dust and the dirt removed from the castings is dropped through the pertoratl into a couvenientenclosure the hotte the machine, whence it is removed by su means shown in the form of an elevator or conveyor chain. a

The abrasive then cleaned. sifted and returned by way of the blast. The cleaning the abrasive. etc, however, iorn'is no part or the nreseut invention. In the form shown the )arrcl is enclosed within a casing from which air is exhausted to keep dwvnthe dust. in order to prevent undue accun'iulation of the abrasiv, dirt and dust in the area at the bottom oi the machine, and to dispose of any Quantity which may accumulate during the operation of the machine, the conveyor or elevator runs crjint-inucusly, the ban being star tQll and stopped at the will of the operator to provide for loading and dumping oi: the barrel and, inspection oi the parts. The invention relates to me.

ans tor rotatabl supi'iorting. guiding and dr ving the bar rel, and to coniointly driving the barrel and conveyor or elevator, provid ng tor stopping and starting the barrel while the conveyor rims continuously.

To avoid the expense incident to producing u'mintainino; closely titted ground bear- 7 to support the weight oi the barrel, it is provmed w: th hard metal 1?Cl li)lllaliJ:Ln\lS oi s hich engage hard metal rollers by i the drum is supported and driven. On

Is e amount of the large (lianieter of the drum,

I w 7,! the mkescnt common sn-zc oi drum being i. 1 inches inside diameter,

turning and grinding of these tires would be cvceedingly cfipensive, am. to avoid this expense, they: re preferably SIGNOR TO PANGBORN CORPORA- MPORATION 0F MARYLAND.

ELEVATOR DRIVE.

Serial No. 88,820.

made of hard rolled steel or correspondingly hard me al, the rolled face of the tire engagin g and bearing on the rollers.

The su 'iporting rollers comprise in the preferred form of machine shown idler rollers which may beset a little forward of the centre of the drum and driving rollers more nearly at the centre of the drum receiving a larger proportion oi the weight, thereby increasing the friction and contributing to a more positive drive.

Rotary drums, etc. are in some instances guided to prevent lateral play and side creep by means of flanges, but in cleaning castings by the present method, the weight of the drum and load is so great that flanges are not effective and are soon ground away.

To take up and limit the side play and to take up end thrust or side thrust, side thrust rollers are provided which engage surfaces on the drum transverse to the axis of rotation. In the present instance the side thrust rollers engage the edges of the bands or tires.

These side thrust rollers shown are tied to the frame by a tension member which applies the side thrust directly to the frame. The tension member is preferably adjustable and the rollers are so adjusted. as to allow a slight degree of side play, one quarter ot an i nch. being a convenient adjustment.

The driving mechanism in this type of machine has in the past given a considerable amount of trouble on. account of slippage of belts, wearing of pulleys and general deterioration on account of grit, requiring a large amount of attention to keep the machines running and involving loss of time for replacement of parts and adjustment.

(be present structure comprises a positive all-metal, i. e gear or gear and chain drive, from the motor or other source of power to the barrel or rollers and conveyor belt, the same being of such a nature that all the parts may be and are completely enclosed, to prevent the access of grit to the Working parts. lly means of the positive drive, dispensing with belts and other devices of uncertain op oration, practically all delays incident to the necessity for replacing belts which have run oil the pulleys, renewing and tightening belts. etc. are eliminated and avoided, the conveyor or elevator being run continuously and the barrel being instantaneously stopped and started at the will of the operator. The control is carried to a point convenient for the ill) ill

tit)

operator in filling, dumping, inspecting and otherwise attending to the operation of the machine so that one operator can in fact cc 'trol or operate efficiently a machine or sever l nnrchines.

1n the accompanying drawin 1 have illustrated a sand blast barrel and elevator drive embodying the features of my invention in the preferred form.

in the drawing- Figure 1 is a rear elevation of the il'iachiuc showing line location and general arrangement of the drive and elevator the parts being onclosed.

Figure 9 is a fragmentary side view look" I from the left in i ure 1, showing the incur and adjacent parts of the drive.

Figure 3 is a detailed view of the geari the lower left in Figure 1 adjacent tne motor the casing being removed and the parts bei o; shown in section on the line El -3 Fi ure z broken away above and at the right for =1 venience of illustration.

l igure l: is a section on the line lal; l: 1 looking to the rightin that tigzuz Figure 5 is an enlarged section on the 55 .lligure 41 showing the mounting of front rollers and side thrust rollers.

Figure ti is a view in the nature of a front elevation, the parts being broken away at the right to shovea section on the line of Figure and on the left showing a sect ion or theline (3-G -l igure l.

Figure 7 is a view on the line 1 id lgu showing the gearing and pulley at t end of the elevator drive shaft.

Figure 8 is a detail of a side tlnust roller unit, the same being in the nature of a central section on the axis of the roller.

Fi 'rure l) is a sectional view of an alternati've belt drive structure correspiniding to Figure 3 and in the same plane.

Figure 10 is a side elevation lookingfrom the operators left which is the right i l ure 1.

Figure 11 is a section on line li---1 l. of Figure Referring to the drznvin each of which is used to indicte the same or as by numerals,

\ similar parts in the different. 1 igures the machine as shown comprises a rotary nd blast barrel 1 enclosed within an outer nag 2,

the ilhiistration also including the el: *ator or conveyor 3 the barrel and elevator being driven by an electric motor l or from some other convenient source of power through an all metal drive (5 which is connected to the elevator for continuous operation of the latter and connected by way of the clutch 8 to the barrel drive rollers 9 providing for the rota" tion of the barrel at the will of the operator.

To the end that the barrel and the elevati'u' may be driven from and by the electric motor 1 or from any suitable source of power as outlined, the motor shaft 11 is (connected to a e pinion 12, which meshes with bevel gear i l, which as shown is in the form of a ring mounteijl on the flange 15, which l '."h sleeve 16 and spur gear 17, the 'illt'llflil and arrangement of such inscribed h rein being more or less is which may be widely the scope of the invention. As o e sleeve 16 pinion 17 and bevel re mounted to rotate on stud 7 which -1-ecured to and in the casin 115 to be described. 1

In accordance with the preferred arrangement the bevelled pinion 12 is mounted on a separate sh afteferrt-id to herein as the pinion shaft 18 which for convenience in removing, for ez ai'ninatiom adjustment and repairs, is mounted in a cage 19 the cage 19 with the shaft 18 and pinion l2 and roller bearings 20 for the shaft heing assen'ibled as a single unit. The cage 19 is can .lQCl in the tubular support 21, vhich is secured to the frame being conveniently formed as part of casing 115. The shafts 11 and 18 are connected by a coupling 22 which is preferably a flexible coupling of any well known type which provides not only for flexibility e voiding the necessity for exact alignment of the parts, but for convenient removal of the shaft 18 and the pinion 12 in and with the ca 19 as aforesaid.

The bevel ring or gear 14 driven by the pinion 1 aforesaid carries a small spur pinion 1'? on the sleeve 16 meshing with and driving the large spur gear 24 which is secured to the chiteh sleeve 25 which is mount- .d in bearings 135, in casing 115, and rotates on and relatively to the horizontal shaft 26 extending across the back of the machine. This clutch sleeve 25 carries secured to its outer or left hand end as seen in Figure 3, a bevel gear which meshes with a bevel pinion Qfrl which drives the elevator shaft 29 flu-(nigh and. by way 'niversal joint 30 the pinion 28 being mounted on a short shaft 32 which has a bearin 136 in the casing 115 and is connected by universal joint 30 to the elevato r sha'rt The universal joint 30 is provided at its u por side with a square socket 33 which is elongated in the direction of the length of the shaft, and shaft 29 has a square elongated end 3 1 which has a sliding tit in said socket providing a driving connection with end play in the direction of the length of the shalt. The illl'fl; 2:) is connected at its upper end, sec .Fi-"ure 7, through a SO "O1 d. universal oint 36 to a short sl'iaft 37 n'iounted in tubular extension 12? of casing 128 and has secured thereto a bevel pinion 38 which meshes with and drives a bevel gear 39 on and secured to a short horizontal shaft- 4:0 mounted in suitable bearings 4-1 in the casing. This shaft carries at its inner end secured thereto a pulley 42 which drives the elevator 3, which. as shown, is in the nature of a conveyor belt 41-3 having small buckets or pockets 44 secured to its outer surface. This belt runs over an idler pulley at the lower end of the belt traverse, and the buckets 44 pick up the used abrasive with the dirt from the castings and whatever dust it may carry, i. e., whatever dust has not been carried off by the exhaust, the abrasive, dirt, etc. being delivered to the bottom of the elevator casing 46 by Way of a downwardly inclined chute or passage 47 leading from beneath the barrel. The barrel is perforated as to its entire cylindrical area, and the abrasive is discharged through the perforations and dropped into chute 47. This chute is provided at its upper end With a deflector or shield 35 which catches some of the material thrown off from the barrel and deflects it toward the chute. The shields arrest the outward motion of the particles and direct them into the chute. The universal joint and the slip joint prevent binding of the gears, etc. in case of vibration and relative motion of the different parts of the machine, which in such a structure cannot be avoided without unduly expensive rigid construction.

It will be apparent from examination of the drive so far described, that the elevator or conve or runs continuously as long as the motor is in operation or any other source of power which may be used is connected to the drive. This provides for the removal of accumulations of abrasive, dirt and dust at the bottom of the machine, and tends to prevent accumulation which might interfere with the efiicient operation of the ma chine. The shaft 26 which through a series of connections to be described drives the barrel, is operated intermittently at the will of the operator, being connected to and disconnected from the continuousiy running sleeve 25 carrying bevel gear 27 and spur gear 24 by means of the clutch 8 which comprises the continuously running sleeve 25 rotating on and relatively to the shaft 26, and a sliding clutch member 50 keyed to the shaft by any preferred type of key or feather 51, so that it rotates with and slides relatively to the shaft. The sliding clutch member 50 and the continuously rotating sleeve 25 are provided with posi tively engaging clutch jaws 52 on their adj acent ends, and the sliding member 50 is moved and controlled by a forked clutch operating lever 54 which engages a groove 55 in the sliding member and is controlled by connecting rod 59, the same being universally connected at 58 to the depending arm 57 Rod. I 9 extends across the rear of the machine from the clutch to the right, as seen from the rear in Figure 1, and is connected to an eccentric pin 60 at the end of the rod remote from the clutch. The drawings show the parts in engaged position. The eccentric pin (i0 is mounted in a rotating head 61 which is in turn mounted in suitable bearings 62 carried in a bracket 63 on the machine frame.

The head 61 is secured to the rear end of actuating shaft 64 which extends from the rear to the front of the machine on the left of the operator and on the right as seen from the rear in Figure 1. This shaft 64 is supported by the head 61 in the bearing 62 at the rear and in a suitable bearing 65 at the front, and it is actuated by means ofa hand crank 66 which is conveniently placed at the left of the operator as he stands in front of the machine, the clutch being engaged and disengaged, starting and stopping the rotation of the barrel as hereinafter described, by turning the crank backwards or forwards through a half turn.

The clutch 8 is illustrated in detail in the cross section, Figure 11, taken on the line 1111 of Figure 3. The illustration shows the casing 127 provided with vertically arranged clutch shaft bearing 801, in which is mounted the clutch actuating shaft 802. The clutch actuating shaft 802 projects upwardly and downwardly from the bearing 801 and carries at its lower end outside the casing a rearwardly projecting horizontal arm 57, the swinging end of the arm being forked at 581 and having mounted in the fork a vertical pin or block 803, which rotates about a ver ti al axis in the forked end of the arm 57. This pin is in turn straddled by the jaws 804 at the end of the rod 59 and a pin 58 is passed through the aws 804 and pin or block 803 forming vertically and horizontally swinging connection between the end of the arm 57 and the connecting rod The clutch actuating shaft 802 carries at its upper end, inside the casing 127, secured to the shaft as the arm 57, a clutch operating fork 805, the arms or tines of the fork being indicated by reference characters 54. This fork straddles or encloses the sliding clutch member 50 and each of the arms o4 carries a follower 806 which rides in the groove 55 of the sliding clutch meinber. Each of the followers 806 connected to the corresponding arm 54 by means of an in wardly projecting radial pin 808, each said pin forming an inward projection or extension of a cap screw 809 seated in the corresponding arm. It is apparent that the clutch is connected when the rod 39 is thrust to the left in Figure 3 and disconnected when it is withdrawn to the right, the clutch member moving in the same direction as does the swinging end of the arm 57 and hence in the same direction as the motion of the connecting rod 59.

{eferring again to Figures 1, 3 and 4, the shaft 26 which is connected and disconnect-- ed, being thrown into and out of operation by the clutch mechanism just described, is connected to the barrel to drive the same by means of chain and sprocket gearing 67 which operates the driving roller 9. The

chain and sprocket gearing ()t comprises a ill iii)

small sprocket 69 secured to the shaft 26 on the end thereof at the right of the observer in Figure 1. This sprocket meshes with and drives a chain 70 which in turn has a driving engagt-mieut with the large sp ocket T1 on the 1e rollers to end of the shalt to of the d1. which the rollers are secured.

Having particular reference to Figure 6, the barrel 1 is 'n'ovided at each end with an outside circular track or barnl which preferably of hard rolled steel, the outer hardened rolled surface of each band bearing); on the rollers. This obviates the necr sity for grinding the tracks and rollers ;.'li'iCh would be exceedingly e211 )Gil ive, particularly in View of the large diameter of the barrel averaging almost live feet. ihis arrange ment provides a low cost aci'aurate, dependable drive of long life and requiring; little or no attention.

A frictional engagement of the tracks with the rollers sullicient to prevent slippage, is produced by the location of the rollers i) beneath the barrel so that they support a considm'ahle portion of the weight the barrel, the driving rollers which are prefmably at lhe rear being}; much nearer the centre and taking a much greater proportion of the weight than do the idler rollers 76 at the front. The driving roller shaft T3 is mounted in suitable bearings '77 in the machine frame one at each side, there being a driving roller 9 at each side of the machine at the rear to co-operate with each of the tracks 75 and an idler roller 76 at the front on each side to support the barrel at the front one idler roller also engaging each track.

The driving; rollers ii are secured to the shaft 7; to rotate therewith. in the form of machine shown they are connected to the shaft by keys 78 and. there is, as snown, a ball thrust bearing, 79 between each roller 9 and the shaft bearing 77. The thrust bearings being inside the casing are protected rom grit and dirt by means of cups 80 which euclose the thrust bearings and the ends ot the bearings 77, the contact being; sealed by means of soft packing rings 81 secured to the edges of the cups.

The means for restraining and limiting side creep of the drum or barrel is an important feature ot the iment-ion. The provision of flanges for this "purpose would be the most usual and ordinary expedient, but ith the great w ht carried by the drum, flanges are not otle tire and are quickly cut and ground away. In the present instanc side creep and play of the drum is limited. detern'iined and :uljusled within the desired lin'iits by means of side thrust rollers 101 bearing; on surfaces of the drum transverse to the axis. Preferably the rollers turn on axes disp sed radially of the drum and bear on the edges of tires, bands or tracks 75. The side creep rollers or thrust rollers are placed at the front of the machine for convenience of design and arrangement and so that they may be adjacent the front door openin Where they are easily inspected, adjusted, and if necessary, removed and re placed.

lhf: front rollers 76 in the form of the invention shown, are mounted to rotate freely on and relatively to a stationary transverse shaft 83 which extends across the machine from side to side, being supported at the sides in adjustable brackets 84. All the rollers are of hard mange. ese steel although they may be of any suitable material. The roller 76 has a ha rd outer shell 85 of manganese steel and an inner bearing iember 86 of softer material which bears directly on the shaft, and it is placed between thrust bearings 87 which bear against laterally adjustable abutments 88 and 89 at each side of the rollers said abutments being mounted to slide on the shaft 83. The abu cuts. 88 and 89 are apertured at 90 to admit the shaft and are adjusted laterally by tension. rod 91, which is threaded :zderablo length both end portions. no outer ends of the rod 91. are adjustably held by nuts one of which may be a lock nut in the b uclce s which brackets are secured menihers 170 by bolts 180. es through the brackets, the nuts on th e outer sides of the brackets, and the abutmenfs no and 89. and the rollers 76 beand ill engag i side of 0 depending extremities of said :me throuedi which depending extremithe tension rod 91 is passed. The front s ppm-ting rollers 76 are preferably provided at each end with projecting cups 97 co-axiy placed in lQSDOCt to the rollers and havtheir rims projecting outwardly at each side and taking over the bearings and complenmntary PlOjQlfl'lUllS 9b of the respective abutiuruts S8 and 89, so that they protect the thrust lmarin s 8'? between said members 98 and 97 from jjllh and di t previously described in connection with the driving rollers. Each of the cups is provid ed with an inwardly projecting soil packing ring 99 which bears against the compleineutary projecting member 98 providing' a seal to pit-meet the bearing. The support 88 on the right is also provided with a shield 100 which projects over the cup for p rposeaof protection. The front rollers are th s adapted for adjustment to alignment w h the tires 0. tracks 75 without danger of cramping; between abntments 88 and 89.

The side thrust rollers 101 are in the pre fo mal form shown mounted on the outside abutment-i S9 of the front rollers. These abntuients 8-9 are provided for tins purpose with upwardly projecting; arms 102 which as shown, are at their upper ends turned inwardly over the thrust bearings 87 providing a support adjacent side edges 103 of the tires or bands 75 for the side thrust rollers 101.

l. ll."

In the preferred form ea: h ot the side thrust rollers is as already outlined, mounted on a pin 104 which is in turn adapted to be removably mounted in the arm 102 which is bored or a portured at 105 10 receive the end 'of the pin at the side of the roller providi e' a loose fit for a the pin so that the pin and roller can be instantaneouslyinounte 1 or removed.

aligned with so that the side thrus reel shout slippine or binding on H e i die edege 10b ot the tire or band or truck 75 which may be termed an axial end surface of the ri transverse to the axis of the barrel.

Each side thrust roller 101 forms with its pin 10 1 a unit :y essei e which aforesaid, is placed in oncrtive position and removed by inserting the pin 10 1in the opening or bore 105 in the support 102 and removing" it. The roller unit as shown. F g ure 8.. and in the preferred form, comprises an outer cylindrical shell 107 which may be of manganese steel other suitable hard material. This shell 107 is in the term of e invention shown, mounted. by means of rol er bearings 108 on the pin 10% which is reduced at 109 torning shoulder 110 to rec be hearing members which heir he :i shoulder 110 and a nut 111 on the o; ill 3 pin. The bearings are positioned in the rollers by ring 113 which may be forced into shell 107. The roil is turther shown nrovided with a pa. 112 adjacent the thrust end of the pin to prevent the entrance of grit and the aperture within the roller is closed by a cap 111-. The bearing is packed with grease.

Figure 5 shows the means for adjusting the front rollers 76 and more particularly the side rollers 101 by means of the stress transmittingr member 91 which is more specifically tension rod an d the nuts 92. 93 and 9 1. The preferred adjustmentwhich is found most effective in practice allows a slight de ree of play between the tires or hands 75 and the side thrust roll rs, the rollers being spaced about further than the space between the outer edges of the bands or -tires. The important advantage of this feature of the invention is that the entire side thrust of the drum which. when it is loaded. is very heavy weighing several tens. is entirely taken. up by the anti-friction rollers referred to and transmitted directly to the frame applying the stresses due to side 19 v where they can be best taken up and resisted. and relieving all tendency to wearing; and grindinn; of the narts on this account. The rollers 76 are adjustable as to alignment to tlier with the shaft 83 by moving the brach 84 to the frontor rear, the bra clzets being: secured by bolts 108 in suitable slip The shatt 83 is stationary and is held in position in the brackets 84 by set screws 109.

A feature of further interest in connection it 18 with .1 carings etc. is a removable Unit as iced, so enclosed as to prevent the access 01" grit. The bevel pinion 12, the bevel gear 1 1, the spur n nion 17 and the spur and bevel gears 27 and 28 are enclosed within a casin 115 which is secured to the frame of the machine and serves as a bracket and support for the bearings ot the shafts and gears enclosed, the sleeve 21 which encloses the shaft unit 18 being integral with this casing.

The universal joint 30 is enclosed within a spherical casing 116 which cooperates with a cup 117 secured to the casing 115, the casing 116 being held in contact with the cup by means oi a yolre 118 secured to the casing by elongated bolts 119. the bolts being adjusted to a su'liicient degree of tension to hold the parts in contact without causing; them to bind.

The spherical casing 116 of the universal joint is provided with tubular extension 120 which receives and encloses with a sliding fit; the end, of tubular housing 121. which enthe shaft the tubular housing 121 bein tree to slide and out of the member 120. The tubular housing 121 enters with a sliding lit within corresponding tubular extension 122 of spherical. casing 123 enclosing the universal joint 36. which is held by means a yoke 12 1 and bolts 125 in running contact with cup 126. formed on the tubular extension 127 of the housing 123 which onuoses and supports bevel gears 38 and 39 which operate the pulley 412 which drives the elevator conveyor 3.

The clutch member 50 on the shaft 26 is enclosed within a casing 129 which is secured to to or sing 115 and is provided with soft husn if or nu chine 130 surround i n o the shaft 26 whereit extends thru the housing. The slie'tt 26 is further provided at its other end with a collar 131 to take no en d play where it enters the hearing at the other side of the 321 chine. There is also a shield 133 which nzmects over the collar and protects the hearing from .Q'l'il). The sprockets and chains 69. end 71 are enclosed within a casing 134- which is secured to the bearing 132 and suitably necked. The manner of protecting: the driving; roller and supnortingr roller bearings has been described. The housings are tilled with grease which tends to prevent the entrance oit grit and provides permanent lubrication.

In Figure 9 a belt drive capable of use alternatively with the motor drive is illustrated. T his includes a belt driven pulley ltl) secu ed to a sleeve tell which rotates itreely on the shaft 1. corresponding to the shaft 26, This sleeve 7 --l curries secured thereto, i here], near t l -3 which drives a bevel pinion l-l-.-l; corresponding to tbnv pinion 28 in ldiygure 3, and conn cted by means of universal 'joiiiit ill) to a sl aft 20 which. drives the elevntor mechanism as in the previous instance. The sleeve ill and the bevel ears 143, I i lei and the shaft 29 run continuously giving t1- centiuuous ope 'ation of the GleVfLi'Ol, the sleeve Lil. is intermittently connected to the shaft H2, which corr sponds to shalt 26, by means of a clutch 1 15 operated by connecting rod 59 and lever 57, Figure 11, as in the previous instance. t 'ihatt 142 carries sprocket 69 and drives the barrel. through rollers 9 as in the motor drive.

The belt driven pulley 1A0, Fig. 9, ru s continuously so long; as the machine is in use. The operation of the conveyor whereby the used abrasive combined with dirt iron. the castinp'i-s and dust produced in the cleaning; op iration are rer ived from the has of the machine, is likewise continuous, the barrel being); started and stopped for dumping and tillin at the will of the operator.

i rhile the operation or the machine will be clear from the description it will be briefly outlined. In order that the barrel or drum may be stopped and snrtet at the vill of the operator to provide for filling: and dumping the cats-tines or other articles being treated, it is oper t-ively connected with and disconnected :l' warn the continuously rotating sleeve 2-5 by means of the clutch member 50, the shaft .26 which is thus rotated intermittently being in turn connected by a continuous drive to the d ruin. 'lhe clutch is controlled through and by way oi connecting rod 59 which reciprocated in the direction oi? its length 2y eccentric pin 60 on the head 61, which is in turn mounted on actuating shatto-t rocked by the cri nk ($6 at the left of the ope 'ator, who stands at the front of the machine.

'lhe continuous positive drive as described, to the elevator and driving rollers, not only provides for continuous operation of the elcvator and intermittent operation of the drum described, but gives the maximum of econoiny and elliciency by dispensing with the slippage and loss incident belt driving and with the cicpense for attention incident to the operation of such mechanism.

The driving; mechanism described with the universal joints at both ends of the elevator driving shalt 29. 2, lso including the slip joint 311-. at one end, dispenses with the necess't r for careful alignment and absolutely righteoung of the strucl struction, vibration ant swayi do not cause binding or crznnping oft ture the drive.

The all metal drive is also practically in dcstructible under ordinary running conditions, and ot a normal length of lite which is so nearly inliinited that deteriorati n of is part of the n'iachine is not an el ment of ex iensc in o 'ieration. and loss cit time of "l niachin on account ot failure of the drive is raeti "ally eliminated. rin important con #ribut-ion to this end results from the provi- '3' e ervine; as an Q'lllcltfli'. 7 1 the coin ilete pro of the worltin; parts from grit and resence of which in large quentiti during the ()QGiZttlOi". ol'f machinery of this general type having been one ot the condiwhich has heretofore prevented the dc- \OlOPlilQllll of the gear drive in this connection.

The nitniner 0t inountii supporting and tlllflntt' the drum on idler rollers T6 and driw in a i clOilb rollers 9, and taking up side thri st by means out side thrust rollers 101, are together and separa ely 1t;.21ltl0(l as important teatures of the invention.

i no use 01 bands or tires 75. preferably of lied steel. to e hard ro ltd ii'ned onluard .y for conta i ii fi necessarily c gives with the 1..

n hands a driving .7

' which is of .isrot in obi'iatcd.

rollers bear on the 5, or any conveiicnt sr ti crse to the s. 'i his 1 a. :tion whereby the side hirust rollers are tied to tie frame by tension eds appt t 1e side thrust directly to the 'ovit -iing for convenient adjuste side play, and the inrnnier mounting the s de thr 1st rollers whereby they are not eny convcn ently accessible, but

pable of in 1. :aucous removal and replacew.,.., tiiQilt picieiablj ol the entire unit, are also je oed as unprwen'ients of great unperaiice i .t. thus described specifically and in at be rel and elevator drive KY embodying); the features the pier red form in orthe ture and operation of the SEUYEC of my invention in der that may be c e? .y uncle wtfi-llil; however, the specific terms heroin L24. used descripth rather than in a liniiti 1 sense, the scope the inve tiox'i being; dei' d in the claims. I

id hat ll chain and desire to secure by Let ters Patent is:

1. ln a sand blast machine, a rotary barrel, a rotary n'ien'lber engaging a. confronting,

ting means to position the side thrust rollers to limit and determine the side play of the barrel.

ll. In a sand blast machine having a rotary barrel, an elevator for removing; the abrasive and dirt discharged irom the barrel, a source of power and positive connections trom the same to the elevator and to said barrel, the connections to the elevator including a pair of universal joints and a shaft floating therebctween, the connections to the barrel including a clutch with clutch operating); means within the control of the operator and rollers supporting the barrel for rotation and for driving; it.

12. In a sand blast machine having a 1'0- tary barrel, means for removing the discharged abrasive, a source of power, a drive from said source o t power to said means, and to the banrel tor rotating the barrel, the driving connections to the abrasive removing means including; a shaft, a universal oint and a slip joint providing for lateral an d end play of the shaft due to vibration and swaying of the parts of the machine.

13. In a sand blast machine, a rotary barrel, means for removing abrasive discharged trom the barrel, a motor, driving connections from said motor to said abrasive removing means con'iprising' toothed gearing, a shatt, universal joints and a slip oint, connections from part of said toothed gearing to the sand blast barrel to drive the same, said latter connections including a clutch and means Within the control of the operator for operating said clutch to start and stop the barrel independently of the conveyor.

14-. In a sand blast machine having a rotary barrel, rollers on which the barrel is mounted for rotation, a shaft for said rollers, side thrust rollers bearing on surfaces of the barrel transverse to the axis of said barrel, carriag es mounted on said shaft tosupport the side thrust rolle's, said carriages bearing ach of them against a supporting roller on one side, abutments on the shaft engaging the supporting" rollers on the other side, a rod for transmitting stress received by the side thrust rollers to the frame of the machine, and means on the rod engaging said abutments and said carriages to adjust the side thrust rollers along the shaft and to provide a corresponding adjustment of the supporting; rollers in the direction of the length of the shaft.

15. In a sand blast machine, a rotary barrel, a shaft mounted parallel to the axis of said barrel, a supporting; roller and an end thrust roller carried by said shaft and engrageable respectn'ely with cylindrical and transverse surfaces oi said barrel, said end thrust roller being slidably mounted on said shaft 16. A sand blast barrel nachine having a rotary barrel, a frame, rollers on which the barrel is mounted for rotation, side thrust rollers engaging a surface of said barrel transverse to the axis of rotation of the barre], said latter rollers being adjustable in the direction of the axis ot the barrel, stress transmitting means c. nding' in the direction of the axis of the b rrel connecting said rollers to the frame oi the machine, and means for adjustably fixing: id side thrust rollers longritudinally of said stress transmitting means.

Signed by me at gerstovvn, Maryland, this 11th day of February, 1926.

FOSTER J. HULL. 

